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High-quality RH gunning mix added with large amount of cast iron powder and production method thereof

A technology of adding a large amount of cast iron powder, applied in the field of refractory materials for RH vacuum refining equipment in steelmaking plants, can solve the problems of failure to achieve gunning maintenance effect, erosion of RH dip tube, poor sintering effect, etc., and achieve high comprehensive utilization value. , The skeleton structure is uniform, and the effect of high-frequency continuous operation is satisfied.

Active Publication Date: 2021-03-12
鞍山市和丰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most common RH gunning materials have poor sintering performance. Even if the gunning adhesion effect is good, the sintering effect is not good. During the RH refining process, the molten steel flows at a high speed, and the attached gunning material is quickly washed down. The gunning maintenance effect was not achieved, resulting in the RH dipping pipe being shut down due to erosion, peeling, and cracks

Method used

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  • High-quality RH gunning mix added with large amount of cast iron powder and production method thereof
  • High-quality RH gunning mix added with large amount of cast iron powder and production method thereof
  • High-quality RH gunning mix added with large amount of cast iron powder and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A steel factory has two 130-ton electric furnaces and two 130-ton "three-vehicle and five-position" RH vacuum treatment tanks. The steel types include high-quality carbon structural steel, alloy structural steel, gear steel, bearing steel, and free-cutting non-quenched and tempered steel. , spring steel, high-pressure boiler and tube billet steel, anchor chain and mooring chain steel, cold pier steel, prestressed steel wire, steel strand and tool steel, etc.

[0035] The vacuum ratio of the steel grades in the steelmaking plant is ~90%. Except that some steel grades of the 200×200mm continuous casting machine are not vacuum treated, other steel grades of the continuous casting slab section are 100% vacuum treated.

[0036] The material used for each gunning repair is 0.1-0.35 tons, the sintering time is required to be less than 10 minutes, and the service life is greater than 2 furnaces. Its production conditions are shown in Table 2.

[0037] Table 2: Example 1 Produc...

Embodiment 2

[0059] In a steel plant, the number of vacuum tanks: 10 (5 for 1#RH and 5 for 2#RH each); process flow: converter→LF→RH→casting machine, converter→RH→casting machine; the temperature of molten steel treated by RH is 1600-1650℃ , The treatment cycle is 35-55min. Other main process parameters are shown in Table 5.

[0060] Table 5: Example 2 Production Conditions

[0061]

[0062]

[0063] The material used for each gunning repair is 0.15-0.35 tons, the sintering time is required to be less than 12 minutes, and the service life is greater than 3 furnaces.

[0064] A high-quality RH gunning material with a large amount of cast iron powder added in the present invention is optimized according to the actual smelting requirements on site. The gunning material is specifically prepared from the following raw materials in parts by weight: 95 mid-grade magnesia: 45-55 parts , Magnesia spinel waste brick: 15-25 parts, composite binder: 12-16 parts, composite sintering agent: 6-12...

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Abstract

The invention relates to a high-quality RH gunning mix added with a large amount of cast iron powder and a production method thereof. The high-quality RH gunning mix is prepared from the following rawmaterials by weight: 35-60 parts of sintered magnesia, 10-30 parts of magnesia spinel waste bricks, 12-22 parts of a composite binding agent, 5-20 parts of a composite sintering agent, 3-10 parts ofa composite auxiliary binding agent and 0.1-2.0 parts of composite fibers. Compared with the prior art, the RH gunning mix has the beneficial effects that: the proportion of an existing RH gunning mixis optimally designed and improved, a large amount of cast iron powder is added for the first time in the domestic range, the sintering performance of the gunning mix is improved, so that the gunningmix meets the requirement for on-site rapid gunning maintenance of an RH dip pipe, the sintering speed is fast, the sintering strength is high, the adhesiveness is good, no resilience exists, the erosion resistance is good, meanwhile, the production method is simple and the raw material cost is lowered.

Description

technical field [0001] The invention relates to a refractory material for RH vacuum refining equipment in a steelmaking plant, in particular to a high-quality RH gunning material added with a large amount of cast iron powder and a production method thereof. Background technique [0002] In recent decades, RH vacuum refining technology has made great progress, from the original single degassing function to the current vacuum degassing, decarburization, oxygen blowing decarburization, powder spraying desulfurization, temperature compensation, removal of inclusions, uniform temperature and Composition and other functions have become the most commonly used secondary refining metallurgical method for smelting high-quality steel in major domestic steel mills. [0003] The RH dipping pipe is the most critical smelting equipment in the RH vacuum treatment and refining process. The RH dipping pipe is composed of four parts: the inner refractory brick, the self-flowing material layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/047
CPCC04B35/047C04B2235/3222C04B2235/405C04B2235/3241C04B2235/402C04B2235/447C04B2235/3427C04B2235/48C04B2235/349C04B2235/3217C04B2235/3243C04B2235/5212C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96Y02P40/60Y02P10/20
Inventor 孙逊王忠明崔高扬张川刘永亮
Owner 鞍山市和丰耐火材料有限公司
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